Aluminum roofing is the metal to choose when rust is the enemy. It never rusts, it is light, and it is the standard for homes within a few miles of salt water, where painted steel finish warranties usually do not apply. Aluminum comes in standing seam, shingle, shake and tile styles with the same PVDF paint finishes as steel. It costs a few dollars more per square foot than steel and dents more easily, but in coastal and humid climates it is usually the better long-term buy.
What aluminum roofing is
Roofing aluminum is a rolled alloy sheet, measured in inches of thickness rather than gauge. For residential standing seam, .032 inch is the common standard and .040 inch is the heavier option for large panels, high wind or heavy snow. Aluminum shingles, shakes and tiles are thinner, because their small, stamped shapes stiffen them. Like steel, aluminum roofing is coil coated with PVDF paint, sold under trade names such as Kynar 500 and Hylar 5000, or with the lower-cost SMP finish. Bare mill-finish aluminum is rarely used on roofs because it stays dull gray and streaks.
Aluminum does not rust because it does not contain iron. Instead it forms a thin, hard oxide layer that protects it, which is why a scratch in the paint on an aluminum panel does not become a rust streak. The metal is also light, roughly a third the weight of steel of the same thickness, easy to form and fully recyclable. Most roofing aluminum already contains a large share of recycled metal.
Aluminum has two traits that shape how it is installed. It is softer than steel, so it dents more easily and shows oil canning, the wavy look on flat panels, more readily. And it expands and contracts with temperature roughly twice as much as steel, so long panels need more room to move.
How it is installed
An aluminum roof goes on the same way as a steel roof in the same style. Standing seam panels are roll formed on site or in a factory, attached with clips and snapped or mechanically seamed. Aluminum shingles and shakes interlock and fasten through hidden flanges. The sequence is the familiar one: tear-off or inspection, deck repair, underlayment, trim, panels, flashings and ridge. Our guides to standing seam and metal shingles cover the steps.
The differences are in the details:
- Fasteners and trim must be aluminum or stainless steel. Plain or galvanized steel screws, clips, rivets and flashing corrode the aluminum where they touch it. Copper is worse.
- Keep aluminum off treated lumber. Most modern pressure-treated wood uses copper-based preservatives that attack aluminum. Furring strips, fascia and blocking need a barrier such as underlayment or a compatible membrane between wood and metal.
- Plan for expansion. Floating clips, hemmed eaves that let the panel slide, and shorter panel lengths or expansion joints on long runs all matter more with aluminum.
- Control oil canning. Striations or pencil ribs in the flat of the panel, narrower panels, .040 thickness on large roofs and a flat deck all help.
- Handle it gently. Aluminum panels bend and crease more easily during carrying and installation, and a crease cannot be fixed.
Where aluminum fits
Climate. This is the main reason to choose aluminum. Within a few miles of the ocean, salt air corrodes the cut edges and scratches of steel panels, and most steel finish warranties exclude or limit that exposure. Aluminum carries its warranty right to the beach. Hot, humid regions and lakefront homes also favor aluminum. In dry inland climates the advantage shrinks and steel usually wins on price and dent resistance. In hail country, aluminum is a fair choice if you step up to .040 and a textured panel.
Roof pitch. The same as the profile you choose. Snap-lock aluminum standing seam is generally for about 3:12 and steeper, mechanical lock for lower slopes, shingles and shakes for 3:12 or 4:12 and up, all per the manufacturer.
House style. Any. Because aluminum takes the same paint and comes in the same profiles as steel, it looks identical from the street. Beach cottages, waterfront moderns, Gulf Coast bungalows and Florida homes are where you see it most, along with historic homes near the water where a copper or zinc roof is out of budget.
Pros and cons
Pros
- Never rusts, even at cut edges and scratches
- Finish warranties that apply near salt water
- Light weight, about a third of steel
- Same profiles and PVDF colors as steel
- Reflective finishes cut attic heat
- High recycled content and fully recyclable
Cons
- Costs a few dollars more per square foot than steel
- Softer, so it dents and creases more easily
- Oil canning shows more on wide flat panels
- Expands and contracts about twice as much as steel
- Must be isolated from steel, copper and treated lumber
- Less stiff underfoot, so .032 is the practical minimum for panels
Approximate 2026 cost
As a broad national range, aluminum standing seam runs roughly $14 to $24 per square foot installed in 2026, and aluminum shingles, shakes and tiles roughly $11 to $20, or about $1,100 to $2,400 per roofing square across the styles. That is typically a few dollars per square foot above the same roof in steel. The premium is almost all material; labor is about the same, and .040 panels cost more than .032.
These are approximate figures, not quotes. Prices vary by region, roof pitch and complexity, thickness, profile, paint system, tear-off and deck repairs, and the time of year, and aluminum prices move with the metal markets. Get three written bids that list the thickness in inches and the alloy or product name so you are comparing the same thing. The metal roof cost guide explains the rest of what drives the number.
What to ask the installer
Most of the risk with aluminum is a crew that treats it like steel and reaches for the wrong screws. Ask about the details that differ.
Confirm licensing where your state requires it, liability and workers compensation insurance, a written contract that names the metal, thickness, profile, finish, color, fasteners and payment schedule, and a permit where your town requires one. In coastal areas, also ask whether the panel carries a Florida Product Approval or Miami-Dade notice of acceptance if your code requires it. Our guide on metal roofs and wind explains those approvals.
Common mistakes and red flags
Galvanic corrosion is the thread running through that list. When two different metals touch and stay wet, one sacrifices itself, and aluminum is usually the one that loses. Keep it paired only with aluminum or stainless steel, and keep it off copper and treated wood.
Related guides
To understand the steel alternative, read steel roofing, Galvalume vs galvanized. For the paint that goes on both metals, see PVDF vs SMP finishes. Compare every roofing metal at the roofing metals hub. Find installers who work in aluminum at the aluminum directory or search by state at Find a Metal Roofer.
Frequently asked questions
Is aluminum roofing better than steel?
It depends on where you live. Aluminum never rusts, so within a few miles of salt water or in very humid climates it outlasts painted steel and keeps its finish warranty where steel warranties are often excluded. Inland, 24 gauge Galvalume steel is stiffer, dents less, costs less and lasts just as long in practice. Neither is better everywhere; aluminum wins near the coast and steel wins on price and dent resistance.
How thick should aluminum roofing be?
Aluminum is measured in inches, not gauge. For standing seam on a house, .032 inch is the common standard and .040 inch is the heavier choice for large panels, high wind or heavy snow. Aluminum shingles and shakes are thinner because their small size and stamped shape add stiffness. Be wary of .024 or thinner aluminum sold as residential standing seam; it will dent and show waviness.
Does aluminum roofing dent in hail?
More readily than steel of a comparable price, because aluminum is softer. Most hail leaves no mark on .032 aluminum, but large hail can dent it, and the dents are cosmetic rather than leaks. If you live in a hail-prone area and want aluminum, choose .040 inch, pick a textured or striated panel that hides dents, and ask your insurer how it treats cosmetic damage on metal roofs.
Can I use steel screws or steel trim with an aluminum roof?
No. Where steel and aluminum touch and get wet, the aluminum corrodes. Fasteners, clips, rivets, flashing and trim on an aluminum roof should be aluminum or stainless steel. Aluminum also should not sit directly on lumber treated with copper-based preservatives, which is most modern treated wood; installers separate the two with underlayment or a barrier. Ask your contractor how they keep metals apart.
Is aluminum roofing more expensive than steel?
Usually by a few dollars per square foot. In 2026, aluminum standing seam often runs roughly $14 to $24 per square foot installed, compared with $12 to $20 for steel, and aluminum shingles roughly $11 to $20. Labor is about the same; the difference is mostly material and tracks the aluminum market. Near the coast the extra cost buys a finish warranty that steel often cannot offer.